The Collaborative International Dictionary of English v.0.48:

Cussedness \Cuss"ed*ness\ (c[u^]s"[e^]d*n[e^]s), n. [Cussed (for
   cursed) + -ness.]
   Disposition to willful wrongdoing; malignity; perversity;
   cantankerousness; obstinacy. [Slang or Colloq., U. S.]
   [Webster 1913 Suppl.]

         In her opinion it was all pure "cussedness." --Mrs.
                                                  Humphry Ward.
   [Webster 1913 Suppl.]

         Disputatiousness and perversity (what the Americans
         call "cussedness").                      --James Bryce.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

cussedness
    n 1: meanspirited disagreeable contrariness [syn: cussedness,
         orneriness]